Got a friend who has a bike with 6" disk brakes and want's to change the rotor to 8". Is it possible to change the rotor while keeping the rest of the brake intact? Or does he need to get a whole new disk brake set for a bigger rotor? I'm assuming he needs to get a new 8" brake set but I dont own any disk brake bikes at the moment so i wouldn't have a clue!

Got a friend who has a bike with 6" disk brakes and want's to change the rotor to 8". Is it possible to change the rotor while keeping the rest of the brake intact? Or does he need to get a whole new disk brake set for a bigger rotor? I'm assuming he needs to get a new 8" brake set but I dont own any disk brake bikes at the moment so i wouldn't have a clue!

Normally all that is needed is the 8 inch disk and the adapter. Everything else will work fine. You may have to get some shims to align the caliper to the rotor since the adapter may not position the caliper perfectly and the adjustment range may need help. It really isn't a big deal, takes maybe 15-20 minutes to do the swap.

Normally all that is needed is the 8 inch disk and the adapter. Everything else will work fine. You may have to get some shims to align the caliper to the rotor since the adapter may not position the caliper perfectly and the adjustment range may need help. It really isn't a big deal, takes maybe 15-20 minutes to do the swap.

Shims? What? When you remove and reinstall a caliper, of course you are going to have to realign it to the disk however, I fail to see a need for shims if you know what you are doing and its a non-Shimano brake. For Hayes and Avid you just need a 8" mounting bracket and an 8" rotor. All their calipers up to a 10" rotor are the same.